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Chapter 1: Q 28. (page 27)
Superpower Refer to Exercise 24.
(a) What proportion of students in the sample who prefer invisibility as their superpower are from the United States?
(b) What percent of students in the sample who are from the United Kingdom prefer superstrength as their superpower?
Part (a)
Part (b) 10%
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Support the court? A news network reported the results of a survey about a controversial court decision. The network initially posted on its website a bar graph of the data similar to the one that follows. Explain how this graph is misleading. (Note: When notified about the misleading nature of its graph, the network posted a corrected version.)
Cool car colors The most popular colors for cars and light trucks change over time. Silver advanced past green in 2000 to become the most popular color worldwide, then gave way to shades of white in 2007. Here is a relative frequency table that summarizes data on the colors of vehicles sold worldwide in a recent year.
(a) What percent of vehicles would fall in the 鈥淥ther鈥� category?
(b) Make a bar graph to display the data. Describe what you see.
(c) Would it be appropriate to make a pie chart of these data? Explain.
Strong paper towels In commercials for Bounty paper towels, the manufacturer claims that they are the 鈥渜uicker picker-upper,鈥� but are they also the stronger picker-upper? Two of Mr. Tabor鈥檚 statistics students, Wesley and Maverick, decided to find out. They selected a random sample of 30 Bounty paper towels and a random sample of 30 generic paper towels and measured their strength when wet. To do this, they uniformly soaked each paper towel with 4 ounces of water, held two opposite edges of the paper towel, and counted how many quarters each paper towel could hold until ripping, alternating brands. The data are displayed in the relative frequency histograms. Compare the distributions
Part (a). Would it be appropriate to use frequency histograms instead of relative frequency histograms in this setting? Explain why or why not.
Part (b). Compare the distributions of number of quarters until breaking for the two paper towel brands
Electing the presidentTo become president of the United States, a candidate does not have to receive a majority of the popular vote. The candidate does have to win a majority of the 538 Electoral College votes. Here is a stemplot of the number of electoral votes in 2016 for each of the 50 states and the District of Columbia:
(a) Find the median.
(b) Without doing any calculations, explain how the mean and median compare.
Hispanic origins Here is a pie chart prepared by the Census Bureau to show the origin of the more than 50 million Hispanics in the United States in 2010. About what percent of Hispanics are Mexican? Puerto Rican?
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